Update base for Update on "[compiler] Track refs through object expre…

…ssions and property lookups"

Summary:
This addresses the issue of the compiler being overly restrictive about refs escaping into object expressions. Rather than erroring whenever a ref flows into an object, we will now treat the object itself as a ref, and apply the same escape rules to it. Whenever we look up a property from a ref value, we now don't know whether that value is itself a ref or a ref value, so we assume it's both.

The same logic applies to ref-accessing functions--if such a function is stored in an object, we'll propagate that property to the object itself and any properties looked up from it.

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